- 1. [Amps] SB220 T/R relay substitution (score: 1)
- Author: g3xaq@hotmail.com (Alan Ibbetson)
- Date: Fri, 15 Nov 2002 21:36:10 +0000
- To: <amps@contesting.com> On my 765 RF output begins 8.5ms after key/PTT closure (after that the RF has a risetime of 3.5ms for 100% output on CW). This is the same on QSK, or VOX, or if the rig is h
- /archives//html/Amps/2002-11/msg00263.html (9,630 bytes)
- 2. [Amps] How light can you make a 500W amplifier? (score: 1)
- Author: g3xaq@hotmail.com (Alan Ibbetson)
- Date: Mon, 14 Oct 2002 20:34:04 +0100
- While exchanging tall tales at the bar at the RSGB HF Convention over the weekend the discussion came round to the need for an amplifier specifically optimised for solo DXpedition use. The holy grail
- /archives//html/Amps/2002-10/msg00132.html (8,612 bytes)
- 3. [Amps] How light can you make a 500W amplifier? (score: 1)
- Author: g3xaq@hotmail.com (Alan Ibbetson)
- Date: Tue, 15 Oct 2002 23:58:38 +0100
- Although Steve doesn't believe it, a Pspice simulation suggests that a 6X multiplier using "just enough" 470uF 385v capacitors to keep within their voltage rating (15 in all) and 240v/50Hz mains giv
- /archives//html/Amps/2002-10/msg00159.html (11,266 bytes)
- 4. [Amps] Dentron DTR-2000 (score: 1)
- Author: g3xaq@hotmail.com (Alan Ibbetson)
- Date: Sun, 20 Oct 2002 18:10:53 +0100
- I have an old DTR2000L. Input SWR is 1.5 on the bands up to and including 20m, rising to 2.5 on 15m, and near infinity on 10m. Mine won't tune properly on 160 and 10m due to shortcomings in the pi t
- /archives//html/Amps/2002-10/msg00219.html (7,355 bytes)
- 5. [Amps] X-ray dangers from amplifiers? (score: 1)
- Author: g3xaq@hotmail.com (Alan Ibbetson)
- Date: Sat, 28 Sep 2002 21:15:01 +0100
- At what anode voltage do valves begin to radiate dangerous X-rays? My schoolboy physics (Plank's constant, etc) suggests frighteningly modest voltages: around 2 Angstroms at only 5KV if there are sui
- /archives//html/Amps/2002-09/msg00265.html (7,571 bytes)
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